MIL-DTL-13931J
g. Base caps of mortar cannon.
4.5.13.2 Heat, forging, or casting numbers of major items. Heat, forging, or casting numbers of major
items shall be preserved throughout the manufacturing processes. If it is necessary to transfer the
numbers to another area during machining, such transfer shall be documented. For source inspected
material, documentation shall be reviewed by the Government representative, and confirmed by the
inspector's stamp next to the transferred number on the material. For destination inspected material the
documentation shall be subject to Government review. The contractor shall maintain a cross-reference
record of heat or forging numbers, shop numbers if applied, and final serial numbers.
4.5.14 Helical springs. Helical springs shall be inspected as prescribed by agency inspection content in
SAE J1122, and applicable QAP, if any.
4.5.15 Threads. Threads shall be checked with thread gages appropriate to the type, form, size and class
of thread specified.
4.5.16 Lubrication. Parts and assembled items shall be inspected for proper lubrication.
4.5.17 Surface texture. Surface texture shall be visually examined by direct comparison with applicable
surface texture specimens conforming to ASME B46.1. In case of dispute, surface texture measuring
equipment conforming to A-A-50767 shall be used.
4.5.18 Workmanship. Parts shall be examined visually to determine compliance with the highest grade
practice used in the manufacture of military weapons. Evidence of poor workmanship shall be:
a. Scratches in excess of drawing and specification requirements
b. Burrs
c. Tool scores or gouges
d. Deformations
e. Knife edges and fins
f. Excess metal
g. Missing or damaged protective finish
h.
Seams or laps
i.
Laminations
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